The ecology of two degraded estuaries on the north coast of Natal, South Africa

Blaber, S. J. M.; Hay, Duncan G.; Cyrus, D. P.; Martin, T. J.

doi:10.1080/02541858.1984.11447884

Cited by 40 publications

(17 citation statements)

References 1 publication

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“…Therefore, these intrusions of the SACW increase the total biomass of phytoplankton in Paranaguá Bay, making food more available for the fish and favoring the nursering and recruitment processes in the area during this period. The dominance of few species of primary consumers, a common fact in estuarine areas (Blaber et al, 1984), characterizes the prevalence of short food chains able to sustain a high density of fish in the system. The juveniles of A. parva and H. clupeola, probably in their first year, corresponded to 69% of the annual production and, through their planktotrophic diet, these fish are the main direct connection with the high primary production in the region.…”

Section: Eucinostomus Melanopterus Cynoscion Acoupa Cynoscion Leiarmentioning

confidence: 99%

A study of the fish community structure in a tidal creek

et al. 2004

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The fish assemblage in a mangrove tidal creek was studied in monthly collections between August 1998 and July 1999 in the quadrature low tide and high tide, using a fyke net of 30 m x 1.5 m and meshes of 8 and 10 mm. Simultaneously with the biological collections, temperature, salinity, pH, water transparency, and current speed data were obtained. The collections resulted in the capture of 36,873 fish representing 22 families and 52 species. Immature individuals abounded (63.8%), and among the adult specimens there was a larger number of females. The species Anchoa parva, Harengula clupeola, Genidens genidens, and Bairdiella ronchus, contributed to 84.9% of the total capture of fish, however the contribution in mass was of 55.2%, indicating a predominance of small individuals. A smaller number of fish and species seem to occupy the area in the period between August and December, in comparison to the period between February and July, when the larger aggregations appear, mainly of the species Anchoa parva, Harengula clupeola, Opisthonema oglinum, Genidens genidens, Diapterus rhombeus, and Bairdiella ronchus. The environmental factors, pH, water transparency, and rainfall seem to have an influence in the structure of the observed biological patterns.Key words: tidal creek, fishes, diversity, abundance, temporal variation. RESUMO Um estudo sobre a estrutura da comunidade de peixes de um rio de maréA comunidade de peixes em um rio de maré de mangue foi estudada em coletas mensais entre agosto de 1998 e julho de 1999 na baixa-mar e preamar de quadratura, utilizando-se uma rede fixa tipo "fyke" com 30 m x 1,5 m e malhas de 8 e 10 mm. Simultaneamente às coletas biológicas, foram registrados dados de temperatura, salinidade, pH, transparência da água e velocidade da corrente. As coletas resultaram na captura de 36.873 peixes, representando 22 famílias e 52 espécies. Predominaram indivíduos imaturos (63,8%) e as fêmeas, entre os adultos. As espécies Anchoa parva, Harengula clupeola, Genidens genidens e Bairdiella ronchus constituíram 84,9% da captura total de peixes, no entanto, a participação em peso foi de 55,2%, indicando o predomínio de indivíduos de pequeno porte. Um menor número de peixes e espécies parece ocupar a área no período entre agosto e dezembro, comparado ao período entre fevereiro e julho, quando aparecem os maiores agregados, principalmente das espécies Anchoa parva, Harengula clupeola, Opisthonema oglinum, Genidens genidens, Diapterus rhombeus e Bairdiella ronchus. O pH, a transparência da água e a pluviosidade parecem influenciar a estruturação dos padrões biológicos observados.Palavras-chave: rios de maré, peixes, diversidade, abundância, variabilidade temporal.

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Section: Eucinostomus Melanopterus Cynoscion Acoupa Cynoscion Leiarmentioning

confidence: 99%

A study of the fish community structure in a tidal creek

et al. 2004

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“…The catch composition resembled that found in the eastern Cape (Marais & Baird 1980;Marais 1981;1983a;b) and Natal (Whitfield 1980;Blaber, Hay, Cyrus & Martin 1984) in that the family Mugilidae dominated the catches (41,7% numerically or 45,8% gravimetrically -Mntafufu; 38,3% numerically or 54,2% gravimetrically -Mzamba). In the Mntafufu 11 species of mullet were caught, V. cunnesius, a small species, being particularly abundant, followed by M. cephalus, M. capensis and V. buchanani.…”

Section: Fish Faunamentioning

confidence: 67%

A survey of the fish fauna of Transkei estuaries Part Four: The Mntafufu and Mzamba River estuaries

Plumstead¹,

Prinsloo²,

Schoonbee³

1991

South African Journal of Zoology

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“…The great number of individuals and biomass of few clupeiforms species in the fall were also found in several studies within and outside the Baía de Paranaguá (Gay et al, 2000;Oliveira Neto et al, 2004;Spach et al, 2004 a;Vendel et al, 2002). The species that are members of the most basal levels of the food web are the most directly favored by the increase in primary productivity that occurs in the warmest seasons of the year (Brandini & Thamm, 1994;Spach et al, 2004 b) and they are the most dominant species in several marine environments (Barreiros et al, 2004;Blaber et al, 1984;Ross et al, 1987). This pattern was also observed in the tidal creeks of the Baía dos Pinheiros, with the dominance of A. parva, C. edentulus and, to a smaller extent, H. clupeola.…”

Section: Discussionmentioning

confidence: 99%

Fish communities of two tidal creeks in the Pinheiros bay, state of Paraná, southern Brazil

Neto¹,

Spach²,

Schwarz³

et al. 2010

Braz. J. Aquat. Sci. Technol.

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Tidal creeks are meandering channels that are highly influenced by tidal changes and can experience substantial variation in salinity and depth over the course of the same day. The goal of the present work is to survey the ichthyofauna associated with these environments and to assess seasonal differences in their composition in tidal creeks of the euhaline sector of the estuary of the Paranaguá. Two tidal creeks of the Pinheiros bay were sampled monthly at the same time using fyke nets. A total of 13,755 fish from 55 species and 27 families were captured. Only the clupeiforms Anchoa parva, Cetengraulis edentulus, and Harengula clupeola showed substantial seasonal variation in abundance, being most frequent during the fall and its adjacent months. Benthophagic individuals such as Sphoeroides testudineus, Bairdiella ronchus and Cathorops spixii were the most dominant in terms of biomass and were present all year long, although with irregular abundance. Sciaenid species were most frequent in the fall and winter, both as juveniles and as adults. The spring and part of the fall were characterized by the highest number of species with mature gonads, whereas the fall was the most important recruitment period, causing an increase in the richness indices and in the number of captured individuals. Tidal creeks were intensively visited by fish of all trophic levels and ages. These results, together with the high richness and diversity indices, corroborate the importance of tidal creeks for the preservation of estuarine environments.

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The ecology of two degraded estuaries on the north coast of Natal, South Africa

Cited by 40 publications

References 1 publication

A study of the fish community structure in a tidal creek

A study of the fish community structure in a tidal creek

A survey of the fish fauna of Transkei estuaries Part Four: The Mntafufu and Mzamba River estuaries

Fish communities of two tidal creeks in the Pinheiros bay, state of Paraná, southern Brazil

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